Discharging-paste and process of making same.



UNITED STATES PATENT OFFICE.

KARL REINKING, OF LUDWIGSHAFEN-ON-THE-RHINE, GERMANY, ASSIGNOR TO BADISCHE ANILIN & SODA FABRIK, OF LUD- W1GSHAFEN-ON-THE-RHINE, GERMANY, A CORPORATION.

DISCHARGlNG-PASTE AND PROCESS OF MAKING SAME- Speciflcatiim of Letters Patent.

Zeatentea May 15,1906.

Application filed January 31,1905. Serial Ito, 243,689-

To all whom fl may cmtcernf Be it known that I, KARL REINKING, a subject of the Prince Regent of Brunswick, residing at Ludwigshafen-on-thc-Rhine, in the Kingdom of Bavaria, German Empire, have invented new and useful Improvements in D1.-;charg1ng-Pastes and Process of Preparing the Same, of which the following is a-specnication.

.pastrs which are much more stable and which also possess an excellent discharging power can be obtained if in the preparation of such pastes a dry'hydrosullite which is free from water of crystallization be employed andat the same time sullieient concentrated salt solution be added, so that the hydrosullite remains practically undissolvcd. The salts which canbe employed in carrying out my invention are those which are readily soluble and which do not yield a precipitate of insoluble hydrosulfite of the metal present. T he kind of salt employed is preferably selected with regard to the nature of the hydrosullite usedlor instance, when sodium hydrosulfite is en'iployed it is most convenient to make use of sodium salts, such as sodium chlorid or sodium acetate; but other salts (for instance, chlorid of zinc and chlorid of calcium) can be employed, ifdesired. The stability of discharging-pastes pre ared according to my invention is extreme y 'good. For in-- stance, textile fabrics printed with a paste'in the preparation of which common salt and sodium hydrosulfite are employed can be dried for several hours at temperatures just below 100 centigrade .without substantially'lossening the power of the discharging material u on steaming. The additions to the dis- 0 urging-pastes which are' described in the specificatlon of Letters Patent No. (44,501

can also be made to thes-newpaste's, if desired.

The following example will serve to further illustrate the nature of my mvent10n,-wh 1ch,

however, is not confined to this example. The parts are by Weight:

(a) "Grind together to a very fine paste sixty parts of h drosulfit pure B. A. S.

F. in powder, thirtyive (35) parts of gl cerin,-

and live (5) parts of caustic-soda so ution, (containing thirty-five (35) per cent. of NaOH.) M

(b) Stir well together while warming equal parts of British gum thickening and a saturated solution ofeommon salt.

In order to repare, for exam Is, a dischargingpaste or arared,stir we ltogether fifty (50) arts oft 1e paste described under (a) with orty (40) parts of the thickening .described under (b) and then'bring the mixture to a consistency convenient for tinting by the addition of ten (10) parts 0 a saturated solution of common salt.

For coloring-matters, which are more easily dischargeable than arared, the paste canbe diluted by the addition of a larger quantity of the thickening described under (1).) or else more of the saturated solution of common salt can be added. Thedischargepaste is printed onto the material, which can then be treated as described in. the abovementioned specification of Letters Patent No. 744,501, or in any suitable manner.

Now What I claim is- 1. As 1 new article pf manufacture a dischargingpaste containing a hydrosulfite and also containing a hereinbefore-defined salt so that the hydrosulfite remainspractically undissolved.

' 2. As a new article of 'manufacture a discharging-paste containing'a hydrosulfite and also containingicommon. salt, so that the hydrosulfite remains practically undis'solved.

3. As a new article of manufacture a dis? fite and also containing ahereinbeforeedefined salt sothat the hydrosulfite remains practithe hydrosulfite. remams practically undissolye'cl. I U

5 As a new article of manufacture a. (illcharging-paste ontaining sodium hydrosuL charging-paste contcining 5 hydrosulfite and also containinge hereinbefore-defined salt so that the hydrosufite remains Jractically un' a solution and solved, glycerin, caustic-soda solution and 10 British gum thickening.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

KARL REINKING. vVitn esses:

J. ALEo. LLOYD, Jos. H. LEUTE. 

